[2] Analysis: Coldest November morning in U.S. since 1976: All 50 state freeze.: http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/11/18/analysis-coldest-november-morning-in-u-s-since-1976-all-50-states-freeze/?tid=hpModule_4697cf50-868d-11e2-9d71-f0feafdd1394